/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/User/SocialUser.h
virtual void HandlePartyRequestToJoinSent ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & PartyLeaderId, const [FDateTime](API\Runtime\Core\Misc\FDateTime) & ExpiresAt, const [ERequestToJoinPartyCompletionResult](API\Plugins\OnlineSubsystem\Interfaces\ERequestToJoinPartyCompletionRes-) Result, [FName](API\Runtime\Core\UObject\FName) JoinMethod )